CN112711075B - Clock calibration system of marine seismic node - Google Patents
Clock calibration system of marine seismic node Download PDFInfo
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- CN112711075B CN112711075B CN201911023787.2A CN201911023787A CN112711075B CN 112711075 B CN112711075 B CN 112711075B CN 201911023787 A CN201911023787 A CN 201911023787A CN 112711075 B CN112711075 B CN 112711075B
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 14
- 229910052701 rubidium Inorganic materials 0.000 claims description 5
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/36—Effecting static or dynamic corrections on records, e.g. correcting spread; Correlating seismic signals; Eliminating effects of unwanted energy
- G01V1/362—Effecting static or dynamic corrections; Stacking
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
- G01V1/3843—Deployment of seismic devices, e.g. of streamers
- G01V1/3852—Deployment of seismic devices, e.g. of streamers to the seabed
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Acoustics & Sound (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Oceanography (AREA)
- Electric Clocks (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a clock calibration system of a marine seismic node, which comprises the following components: the system comprises an antenna module, a plurality of clock sources connected with the antenna module, a plurality of pulse distributors connected with each clock source, a plurality of marine seismic nodes connected with each pulse distributor and a server connected with the marine seismic nodes, wherein the antenna module is used for collecting first time pulse signals; the clock source is used for obtaining a plurality of paths of second time pulse signals synchronous with the first time pulse signals; the pulse distributor is used for distributing each path of second time pulse signals into a plurality of paths of third time pulse signals; the server is used for generating a clock calibration instruction and sending the clock calibration instruction to the ocean seismic node; the marine seismic node is configured to calibrate the local clock based on the clock calibration command and the third time pulse signal. The invention can realize the clock calibration of the large-scale marine seismic nodes and improve the efficiency and accuracy of the clock calibration.
Description
Technical Field
The invention relates to the technical field of marine seismic exploration, in particular to a clock calibration system of marine seismic nodes.
Background
In recent years, marine oil and gas resources gradually become the focus of international energy competition, and offshore oil and gas exploration also becomes a research hotspot in the technical field of oil and gas exploration. OBN (Ocean Bottom Node) marine seismic node equipment is becoming the dominant acquisition equipment for offshore oil and gas exploration. The marine seismic node is an underwater seismic node acquisition station without a transmission cable, and can automatically acquire and store seismic data. The problems of large redundancy of acquisition equipment and high exploration cost caused by wired transmission of offshore high-density seismic exploration equipment are solved. The marine seismic node has higher flexibility, is convenient to arrange and recycle, can meet the exploration requirements of high density and high coverage times, can obtain all-dimensional high-fidelity data, and improves the seismic acquisition imaging quality. The operation mode based on the marine seismic nodes has easy operability and relatively small safety risk, and is an important development trend of marine exploration.
The accurate synchronous acquisition of the marine seismic nodes is a core technology of node control, a high-precision clock is adopted in the marine seismic nodes, the accuracy of synchronous acquisition can be effectively improved by controlling the clock, however, the clock can age along with the time, the frequency accuracy of the clock can be reduced, and thus the synchronous acquisition is inaccurate. In order to ensure the accuracy of synchronous acquisition, the clocks in the marine seismic nodes are calibrated before each construction, so that the clock frequency of the clocks is recovered to the original accuracy, and the existing clock calibration method is low in efficiency and only suitable for clock calibration of marine seismic nodes with a small number.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a clock calibration system of a marine seismic node, which is used for realizing the clock calibration of the marine seismic node in a large scale and improving the efficiency and the accuracy of the clock calibration, and comprises the following steps:
an antenna module, a plurality of clock sources connected to the antenna module, a plurality of pulse distributors connected to each clock source, a plurality of marine seismic nodes connected to each pulse distributor, a server connected to the plurality of marine seismic nodes;
the antenna module is used for collecting a first time pulse signal;
the clock source is used for obtaining a plurality of paths of second time pulse signals synchronous with the first time pulse signals according to the first time pulse signals;
the pulse distributor is used for distributing each path of second time pulse signals into a plurality of paths of third time pulse signals;
the server is used for generating a clock calibration instruction and sending the clock calibration instruction to the ocean seismic node;
the marine seismic node is configured to calibrate the local clock based on the clock calibration command and the third time pulse signal.
The embodiment of the invention is as follows: the antenna module is connected with a plurality of clock sources, each clock source is connected with a plurality of pulse distributors, each pulse distributor is connected with a plurality of marine seismic nodes, and the plurality of marine seismic nodes are connected with the server, so that time pulse signals can be efficiently and synchronously transmitted to a large-scale marine seismic node, and meanwhile, the data transmission between the server and the large-scale marine seismic node can be realized; according to the clock calibration instruction and the third time pulse signal, the local clock is calibrated by the marine seismic node, so that the high-precision clock calibration of the marine seismic node in a large scale can be realized.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a clock calibration system for marine seismic nodes in accordance with an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
The accurate synchronous acquisition of the marine seismic nodes is a core technology of node control, and how to ensure the accuracy of clocks of the marine seismic nodes before launching is a key of the synchronous acquisition technology, in order to realize the clock calibration of the marine seismic nodes in a large scale and improve the efficiency and accuracy of the clock calibration, in the embodiment of the invention, a clock calibration system of the marine seismic nodes is provided, and fig. 1 is a schematic diagram of a clock calibration system structure of the marine seismic nodes provided in the embodiment of the invention, as shown in fig. 1, the system comprises:
an antenna module 01, a plurality of clock sources 02 connected to the antenna module, a plurality of pulse distributors 03 connected to each clock source 02, a plurality of marine seismic nodes 04 connected to each pulse distributor 03, and a server 07 connected to the plurality of marine seismic nodes 04;
the antenna module 01 is used for collecting a first time pulse signal;
the clock source 02 is used for obtaining a plurality of paths of second time pulse signals synchronous with the first time pulse signals according to the first time pulse signals;
the pulse distributor 03 is used for distributing each path of second time pulse signals into a plurality of paths of third time pulse signals;
the server 07 is used for generating a clock calibration instruction and sending the clock calibration instruction to the ocean seismic node 04;
the marine seismic node 04 is configured to calibrate a local clock based on the clock calibration command and the third time pulse signal.
As shown in fig. 1, the embodiment of the invention is implemented by: the antenna module is connected with a plurality of clock sources, each clock source is connected with a plurality of pulse distributors, each pulse distributor is connected with a plurality of marine seismic nodes, and the plurality of marine seismic nodes are connected with the server, so that time pulse signals can be efficiently and synchronously transmitted to a large-scale marine seismic node, and meanwhile, the data transmission between the server and the large-scale marine seismic node can be realized; according to the clock calibration instruction and the third time pulse signal, the local clock is calibrated by the marine seismic node, so that the high-precision clock calibration of the marine seismic node in a large scale can be realized.
In specific implementation, the antenna module 01 may be connected to 10 clock sources 02, each clock source 02 may be connected to 16 pulse distributors 03, and each pulse distributor 03 may be connected to 15 marine seismic nodes 04, so that time pulse signals may be efficiently and synchronously transmitted to 2400 marine seismic nodes 04, and the number of the antenna module 01, the clock sources 02 and the pulse distributors 03 may be extended and adjusted according to the number of the marine seismic nodes 04.
In the embodiment, the antenna module 01, the clock source 02 and the pulse distributor 03 are connected by radio frequency wires, and the radio frequency wires can ensure the precision of the time pulse signals.
In an embodiment, the marine seismic node clock calibration system further comprises: a first switch 06 connected to the server 07, and a plurality of second switches 05 connected to the first switch 06; wherein each second switch 05 is connected to a plurality of marine seismic nodes 04.
In an embodiment, the first switch 06 is a tera switch; the second switch 05 is a gigabit switch.
In an embodiment, the server 07 includes a tera-network card for connecting to a tera-switch.
In the embodiment, the server 07 is connected with the tera-megaswitch through optical fibers; the universal switch and the gigabit switch are connected by more than 6 kinds of network cables; the gigabit switch is connected with the marine seismic node 04 by more than 5 types of network cables.
In specific implementation, the server 07 may be provided with two tera-network cards, where the two tera-network cards are respectively connected with 2 tera-switches, each tera-switch may be respectively connected with 48 giga-switches, each giga-switch is respectively connected with 23 marine seismic nodes 04, the server 07 may perform data transmission with 2208 marine seismic nodes 04 through the tera-switches and the giga-switches, and control 2208 marine seismic nodes 04 to perform clock calibration, and the number of the server 07, the tera-switches and the giga-switches may be extended and adjusted according to the number of the marine seismic nodes 04.
In specific implementation, the antenna module 01 collects a first time pulse signal. The first time pulse signal can be a GPS and/or Beidou radio frequency signal, and the antenna module 01 can acquire the GPS and/or Beidou radio frequency signal and can be respectively connected with the 10 clock sources 02 to transmit the GPS and/or Beidou radio frequency signal to the 10 clock sources 02.
In the embodiment, the antenna module 01 is specifically configured to access two paths of antennas.
In an embodiment, the antenna module 01 is specifically configured to combine GPS and/or beidou radio frequency signals from two antennas.
In an embodiment, the antenna module 01 is further configured to dynamically switch to another antenna for receiving a signal when the signal received by any one antenna is unavailable.
In specific implementation, the antenna module 01 can be connected to two paths of antennas, and the antennas can be a GPS/Beidou dual-mode antenna and are used for receiving radio frequency signals of GPS satellites and/or Beidou satellites, when the two paths of antennas normally receive signals, the GPS and/or Beidou radio frequency signals of the two paths of GPS antennas are combined, and when signals received by any path of antennas are unavailable, the signals are dynamically switched to the other path of antennas to receive signals.
In implementation, the clock source 02 obtains multiple second time pulse signals synchronized with the first time pulse signals according to the first time pulse signals. The second time pulse signal can be a second pulse signal synchronous with the GPS and/or the Beidou radio frequency signal, the clock source 02 can receive the GPS and/or the Beidou radio frequency signal from the antenna module 01, output the second pulse signal synchronous with the GPS and/or the Beidou radio frequency signal, the second pulse level is a TTL level signal, the precision is less than or equal to 30ns, each clock source 02 can be respectively connected with 16 pulse distributors, and the second pulse signal is transmitted to the 16 pulse distributors 03.
In an embodiment, the clock source may further comprise a rubidium atomic clock for self-clocking when the antenna module 01 loses the first time pulse signal.
In specific implementation, the rubidium atomic clock is a synchronous clock with high precision and high reliability, when signals received by two paths of antennas of the antenna module 01 are unavailable due to the severe external environment, the rubidium atomic clock can be accurately monitored, time pulse signals with high reliability can be continuously provided, and the monitoring capability of the rubidium atomic clock is as follows: 500ns (24 hours).
In particular, the pulse distributor 03 distributes each second time pulse signal into a plurality of third time pulse signals. The pulse distributor 03 can distribute 1 path of pulse per second signal into 15 paths of pulse per second signals, the delay of an input channel and an output channel of the pulse distributor 03 is less than 50ns, the phase difference between the input channel and the output channel is plus or minus 2ns, the consistency of the input pulse per second signals and the output pulse per second signals can be ensured, each pulse distributor 03 can be respectively connected with 15 marine seismic nodes 04, and the pulse per second signals are transmitted to the 15 marine seismic nodes 04.
In particular, the server 07 is configured to generate a clock calibration command and transmit the clock calibration command to the ocean seismic node.
In an embodiment, the server 07 is also used to view the clock status of the marine seismic node.
In specific implementation, the server 07 may include: the dual-CPU main frequency 3.2G12 core, the 64G memory, the 10 2.4T mechanical hard disks and the tera-network card with the optical module greatly improve the data transmission rate. The multi-megaphone network card can be expanded, and each megaphone network card is connected with 1 megaphone switch through optical fibers. The server 07 may include clock calibration software that may view the clock state information of all the marine seismic nodes 04 and generate clock calibration instructions before all the marine seismic nodes 04 are launched, send the clock calibration instructions to all the marine seismic nodes 04, and the clock calibration instructions of the server 07 and the clock state information of the marine seismic nodes 04 are all transmitted over the fiber optic network.
The server 07 may perform data transmission with a plurality of marine seismic nodes 04 through a tera switch, a gigabit switch, each tera switch including: 48 giga network interfaces, 4 megaoptical interfaces, wherein, 4 optical interfaces are connected with the meganetwork card of the server 07, 48 giga interfaces are connected with 48 giga switches, and each giga switch comprises: 1 input port and 23 output ports, wherein 1 input port is connected with a tera switch and 23 output ports are connected with 23 marine seismic nodes 04.
In particular, the marine seismic node 04 is configured to calibrate a local clock based on the clock calibration command and the third time pulse signal.
In an embodiment, the marine seismic node 04 includes:
and the MCU is used for receiving the clock calibration command and the third time pulse signal and calibrating the local clock according to the clock calibration command and the third time pulse signal.
In specific implementation, clock calibration software on the server 07 transmits clock calibration control instructions to each marine seismic node 04 in batches through a tera switch and a giga switch based on an optical fiber network, the marine seismic node 04 obtains high-precision second pulse signals through the antenna module 01, the clock source 02 and the pulse distributor 03, and after receiving the clock calibration instructions, an MCU in the marine seismic node 04 compares the second pulse signals with local clock information, and controls clocks through an internal serial port based on time difference of the second pulse signals and the local clock information to perform clock calibration.
In summary, the embodiment of the invention is as follows: the antenna module is connected with a plurality of clock sources, each clock source is connected with a plurality of pulse distributors, each pulse distributor is connected with a plurality of marine seismic nodes, and the plurality of marine seismic nodes are connected with the server, so that time pulse signals can be efficiently and synchronously transmitted to a large-scale marine seismic node, and meanwhile, the data transmission between the server and the large-scale marine seismic node can be realized; according to the clock calibration instruction and the third time pulse signal, the local clock is calibrated by the marine seismic node, so that the high-precision clock calibration of the marine seismic node in a large scale can be realized.
While the foregoing detailed description of the invention has been presented for purposes of illustration and description, it should be understood that the foregoing is only a preferred embodiment of the invention and is not intended to limit the invention thereto, since numerous modifications and variations may be made to the embodiments of the invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A system for clock calibration of a marine seismic node, comprising: an antenna module, a plurality of clock sources connected to the antenna module, a plurality of pulse distributors connected to each clock source, a plurality of marine seismic nodes connected to each pulse distributor, a server connected to the plurality of marine seismic nodes;
the antenna module is used for collecting first time pulse signals;
the clock source is used for obtaining a plurality of paths of second time pulse signals synchronous with the first time pulse signals according to the first time pulse signals;
the pulse distributor is used for distributing each path of second time pulse signals into a plurality of paths of third time pulse signals;
the server is used for generating a clock calibration instruction and sending the clock calibration instruction to the ocean seismic node;
the marine seismic node is configured to calibrate a local clock based on the clock calibration command and the third time pulse signal.
2. The system of claim 1, wherein the clock source comprises a rubidium atomic clock for self-clocking when the antenna module loses the first time pulse signal.
3. The system of claim 1, wherein the system further comprises: a first switch connected to the server, and a plurality of second switches connected to the first switch;
wherein each second switch is connected to a plurality of marine seismic nodes.
4. The system of claim 3, wherein the first switch is a tera switch; the second switch is a gigabit switch.
5. The system of claim 4, wherein the server comprises a tera-network card for connecting the tera-switch.
6. The system of claim 5, wherein the server is optically coupled to the tera-megaswitch; the tera switch and the gigabit switch are connected by more than 6 types of network cables; the gigabit switch is connected with the marine seismic nodes through more than 5 types of network cables.
7. The system of claim 1, wherein the server is further configured to view a clock status of the marine seismic node.
8. The system of claim 1, wherein the antenna module is specifically configured to access two antennas.
9. The system of claim 8, wherein the antenna module is specifically configured to combine GPS and/or beidou radio frequency signals from two antennas.
10. The system of claim 1, wherein the marine seismic node comprises:
and the MCU is used for receiving the clock calibration instruction and the third time pulse signal and calibrating a local clock according to the clock calibration instruction and the third time pulse signal.
11. The system of claim 1, wherein the antenna module, clock source and pulse distributor are connected by radio frequency lines.
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| CN201911023787.2A CN112711075B (en) | 2019-10-25 | 2019-10-25 | Clock calibration system of marine seismic node |
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| CN201911023787.2A CN112711075B (en) | 2019-10-25 | 2019-10-25 | Clock calibration system of marine seismic node |
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| CN112711075B true CN112711075B (en) | 2024-03-26 |
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